Function rustfmt_nightly::attr::take_while_with_pred

fn take_while_with_pred<'a, P>(
    context: &RewriteContext<'_>, 
    attrs: &'a [Attribute], 
    pred: P
) -> &'a [Attribute] where
    P: Fn(&Attribute) -> bool, 

Returns the first group of attributes that fills the given predicate. We consider two doc comments are in different group if they are separated by normal comments.